So since redundancy & horizontal scaling are goals of Gitaly HA am I to understand that right now GitLab.com is run on some ad-hoc setup like what I described,

So since redundancy & horizontal scaling are goals of Gitaly HA am I to understand that right now GitLab.com is run on some ad-hoc setup like what I described, and you can lose data if you're unlucky enough with a machine or two disks going down at the same time?